Abstract
Cultivated land is an important carrier of grain production, and scientific assessing of cultivated land productivity is of great significance to ensure food security. This paper assessed the overall productivity of cultivated land in Yuanjiang city from the perspectives of quantitative structure, spatial distribution and correlation with national land use. We applied statistical and GIS (geographic information system) spatial analysis methods to 16 secondary indicators of productivity. The results showed that the productivity index of cultivated land ranged from 1642.79 to 4140.09, concentrated in classes 2–6, among the most productive of 15 classes in total. The cultivated productivity indexes of most towns showed quantitative structural patterns of “inverted pyramid” and “dumbbell” types. Cultivated lands with high productivity showed a spatial distribution that decreased from the north to the south and increased from the center to the periphery. The spatial distribution of the higher-level classes in the cultivated land productivity index and the national cultivated land use index was similar. The correlation coefficient between the indexes for cultivated land productivity and the annual standard crop yield was 0.8817, implying that the index reflected local grain production capacity very well. In general, the research offered a reference and technical support for the sustainable use of cultivated land resources and enhanced regional cultivated land production capacity.
Highlights
Cultivated land is one of the fundamental elements that governs the production capacity of food and is an essential and important resource and material base for humans [1,2,3]
Studying regional grain production capacity and spatial change is of great practical significance for the implementation of the policy to protect farmland and for guaranteeing food security [7,8,9]
Research into the productive capacity of cultivated land in countries outside China has mainly focused on the potential of land production and the influence of factors such as light, temperature, soi conditions and water conditions on crop yield [10,11]
Summary
Cultivated land is one of the fundamental elements that governs the production capacity of food and is an essential and important resource and material base for humans [1,2,3]. Researchers have calculated cultivated land productivity and have analyzed the differences in time and space and the influencing factors [25] based on the results of grading agricultural land [26], evaluating cultivated land quality [27] and testing regional yields [28] through the potential decay method, improved agricultural ecological zoning and the agro-ecological zone model [24,29,30], or building a new cultivated land productivity evaluation system [31]. This will provide a reference and technical support for the sustainable use of cultivated land resources and greater regional cultivated land production capacity
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